Method for starting gas-conducting lamp and lamp for carrying out the method
First Claim
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1. A starting circuit for a gas-conducting lamp comprising a lamp tube without a filament;
- first and second contacts for connecting the circuit to a source of power at a predetermined power frequency;
a single inductor series connected with said contacts and with said lamp tube;
a single capacitor; and
switching means for switching said capacitor between a first condition in which said capacitor is connected in LC resonance with said inductor for producing a large instantaneous resonant current at said power frequency and a second condition in which said capacitor ceases to be in LC resonance with said inductor to produce a high inductive voltage accross said lamp tube to start said lamp tube and to increase the power factor and/or series impedance of the circuit by said capacitor during the operation of said lamp tube.
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Abstract
According to this invention, there is provided a method for starting a gas-conducting lamp, by which a gas-conducting lamp is started directly by a high-voltage without pre-heating of filament. Such a high-voltage is realized by an inductor-capator resonant circuit (LC resonant circuit) or a tap of an inductor. According to this invention, there is also provided a gas-conducting lamp for carring-out the abovementioned method. The method according to this invention is simple and effective and is adapted to the use of a gas-conducting lamp without filament or that with filament which has been broken or has failed.
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7 Claims
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1. A starting circuit for a gas-conducting lamp comprising a lamp tube without a filament;
- first and second contacts for connecting the circuit to a source of power at a predetermined power frequency;
a single inductor series connected with said contacts and with said lamp tube;
a single capacitor; and
switching means for switching said capacitor between a first condition in which said capacitor is connected in LC resonance with said inductor for producing a large instantaneous resonant current at said power frequency and a second condition in which said capacitor ceases to be in LC resonance with said inductor to produce a high inductive voltage accross said lamp tube to start said lamp tube and to increase the power factor and/or series impedance of the circuit by said capacitor during the operation of said lamp tube. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- first and second contacts for connecting the circuit to a source of power at a predetermined power frequency;
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